The technique whereby x-rays are transmitted through a specimen onto a fluorescent screen which is viewed either directly or indirectly is called a) radiography b) fluoroscopy c) CCTV d) transmission viewing

In fluoroscopic viewing, thin sections of a specimen of uniform material area) brighter than thick sections b) darker than thick sections c) not likely to show any defects d) not possible to contrast with thick sections

Even with the use of image intensifiers, fluoroscopy in industrial radiography has limited application becausea) sensitivity is poorer than film b) no permanent record can be made c) it is not as safe as film radiography d) all of the above

The material used to provide the high degree of sheilding needed in an exposure device (gamma camera) is a) lead b) zircoloy c) depleted uranium d) stainless steel

In order to check for possible leakage of radioactive material from a cobalt camera the _________ is used.a) TLD b) wipe test c) G-M counter d) DRD

Most thermoluminescence systems use ____ crystals.a) silver bromide b) ferrous sulphate c) lithium fluoride d) zinc sulphide

Sr-85 has a 64 day half life. If a sample is presently 200 MBq what was its activity 100 days ago? a) 589 MBq b) 538 MBq c) 477 MBq d) 369 MBq

The purpose of indicating distance along a weld on a radiograph by means of lead numbers is to a) correct for parallax b) meet code requirements c) accurately locate defects d) all of the above

B

A

A

C

B

C

A

C